247443649 has 2 divisors, whose sum is σ = 247443650. Its totient is φ = 247443648.

The previous prime is 247443613. The next prime is 247443701. The reversal of 247443649 is 946344742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183331600 + 64112049 = 13540^2 + 8007^2 .

It is a cyclic number.

It is not a de Polignac number, because 247443649 - 2²³ = 239055041 is a prime.

It is a super-2 number, since 2×247443649² = 122456718860870402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (247443349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123721824 + 123721825.

It is an arithmetic number, because the mean of its divisors is an integer number (123721825).

Almost surely, 2^247443649 is an apocalyptic number.

It is an amenable number.

247443649 is a deficient number, since it is larger than the sum of its proper divisors (1).

247443649 is an equidigital number, since it uses as much as digits as its factorization.

247443649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 43.

The square root of 247443649 is about 15730.3416682537. The cubic root of 247443649 is about 627.8059641321.

The spelling of 247443649 in words is "two hundred forty-seven million, four hundred forty-three thousand, six hundred forty-nine".